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operating instructions and Parts manual
meAsurinG tHe FrequenCy oF tHe HiGH-
tension iGnition PuLses
This unit can measure the frequency of the high-tension
ignition pulses. Placing its probe tip next to a spark plug
wire (DO NOT pierce it directly), through capacitive cou-
pling, it can see the high-tension ignition pulses and at
the same time display a frequency reading.
1. meAsurinG metHod
.1-cylinder gasoline engine
High-tension wire
Spark plug
2. distributor type multi-cylinder gasoline engine
Where all the high-tension wires of
Spark plugs
cylinders are bundled together.
Figure A
High-tension wire connecting distributor
and ignition coil.
Figure B
As shown in the figure A and B, bring the probe tip
close to the high-tension wire that connects to the
distributor and the ignition coil, or to the place where
all the high-tension wires of the cylinders are bundled
together.
Auto CirCuit tester
muLti-CyLinder GAsoLine enGine WitHout
distriButor
Bring the detection head close to the place where the
high-tension wire of each cylinder is bundled together.
The measurement is impossible if all the high-tension
wires are not bundled together since the distance be-
tween the detection head and each high-tension wire
differs.
2. specifications
Applicable engine type: Gasoline engine
2-cycle (1,2,3,4-cylinders)
4-cycle(1,2,3,4,5,6,8,12-cylinders)
Detection method: Ignition spark noise detection
Detection object: High-tension wire or ignition cord
3. Calculating the rotational speed of engine
To calculate the rotational speed of engine according
to the measured frequency. The calculation format is
as follows:
n=60×f×1/PR
The "n" denotes the rotational speed of the engine.
The "f" denotes the frequency of high-tension ignition
pulses.
The "PR"denotes the ratio coefficient between the
"f" and the "n".
The number of "PR" types of engines are as follows:
Pr
1/21
1
3/23
2
5/25
3
4
6
Warning: do not ContACt ProBe tiP direCtLy
to tHe seCondAry iGnition CirCuit
PeAK deteCtion
The operator can pre-select the peak threshold levels,
and then contact a circuit if the voltage is greater than
the threshold, you can hear the audio alarm.
The peak threshold voltage settings loop incrementally
from 0.5, to 1.0, to 2.0, to 5.0 , to 10.0 ,to 48.0 and
return back to 0.5 again.
7
4-cycle
2-cycle
1 cylinder
2 cylinder
1 cylinder
3 cylinder
4 cylinder
2 cylinder
5 cylinder
6 cylinder
3 cylinder
8 cylinder
4 cylinder
12 cylinder
24366
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